Automatic cut-off for gas-burners.



No. 734,521. PATENTEDJULY 2.8, 1903.

L. 'F. D UGKER.

AUTOMATIC GUT-OPP FOR GAS BURNERS. APPLIOATION FILED JUNE 12, 1902.

I'm MODEL.

otherend to a flangeton the burner a.

are. te gsai.

UNITED STATES Patented July 28, mos.

"PATENT QFFIGE.

LOUIS F. DUCKER, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO DUOKER AUTOMATIC GAS OUT-OFF COMPANY, OF AUGUSTA, MAINE.

AUTOMATIC CUT-OFF FOR GAS-BURNERS.

SPECIFICATION forming part of Letters Patent No. 734,521, dated July 28, 1903.

Application filed June 12, 1902.

provide a gas-burner with a valve which is thermostaticallycontrolled under conditions as will be described and which can be applied to a gas-pipe in place of the usual burner.

Figure 1 represents in elevation a detachable bnrner provided with an automatic cut-V ofi embodying this invention; Fig. 2, an elevation of the burner shown in Fig. 1 looking toward the right, with parts removed; and Fig. 3, a view similar to Fig. 2, showing the thermostat in its operative position.

Referring to the drawings, a represents a gas-burner provided withasuitably-threaded socket for attachment in the usual manner to a gaspipe. (Not herein shown.) The burner 01. is provided with a valve I), controlling the passage of the gas to the tip a, which latter may be of any usual or suitable construction. The valve 1) is provided at one end with a key d and at its opposite end with a spindle or projection 6, upon which is loosely mounted a dog or projection f, which cooperates with a stud or pin 9 on the valve 1). The dog or projectionfis normally held in engagement with the stud g, as represented in Fig. 2, by a spring h, herein shown as fastened at one end to the dog fand at the The flange i at its upper end is cut away to leave an opening through which extends a finger or projection j on a lever 70, which is vertically arranged, as herein shown, being pivoted at m out of line with the center of the valve b and having a long arm 11, extended to near the top of the burner, where it is suitably secured, as bya pin 0, to the free end of a ther- 5o mostatic strip 19, which is shown as encircling the upper portion q of the burner, to which Serial No. 111,240. (No model.)

one end of said strip is secured. In the normal position of the lever l0 (shown in Fig. 2) the finger or projection'jis removed from the path of movement of the dog or arm f, so that when the valve 1) is opened, whichis effected by rotating the valve in the direction indicated by the arrow 20 thereon in Fig. 2, the dog or arm f is carried by the pin g into the position shown in Fig. 3, in which position it is held while the gas is being lighted. As soon as the gas is lighted the heat from the burner-tip expands the'thermostatic strip 19 and moves the same in the direction indicated by the arrow 30 in Fig. 2, thus turning the lever'lc on its pivot and moving the finger or projection j downward in the arc of a circle in the same plane asthe dog or arm and bringing the said finger into the path of movement of the dog or arm f, which position is represented in Fig. 3. The dog or arm 'f is held in the position shown in Fig. 3 against the action of the spring h as long as the gas remains lighted at the burner-tip;'but if for any reason the flame should be extinguished the thermostatic strip 19 will cool and contract and move the lever back into the position shown in Fig. 2, thereby removing the finger or projectionj from engagement with the dog or arm f and releasing the same, so that the 1311+ ter is moved by thev spring h in the direction opposite to that indicated bythe arrow 20, Fig. 2. The dog or arm f rotates the valve b into its closed position by reason of the engagement of the pin .or projection g with the said dog or arm. When the key (2 is turned so as to open the valve, and thereby bring the dog or armfinto the position shown in Fig. 3, the locking-lever 70 remains in its normal or inoperative position until the gas is light- 4 ed, and if the hand is removed from the valve after it has once been opened and before the gas has been lighted the spring 72 will immediately close the valve, thus avoiding accidents from this source.

The burner may and preferably will be pro vided with a section 0" of insulating material, by which the heat from the burner-tip is prevented from reaching the lower parts of the burner, thereby preventing the valve, the dog, and the lower part of the lever 70 from being unduly heated, and thereby preventedfrom acting freely. The insulating-section r insures the sensitiveness of the device being maintained.

The thermostat andthe upper portion of the lever 70 may and preferably Will be inclosed in a cylinder or casing .9, while the dog fand the spring It may and preferably will be inclosed by the cap 15, which cooperates with the flange 11 on the burner, so that the operative parts are covered and fully protected from injury and accidental derangement.

I claim- 1. The combination with a gas-burner provided with a valve, a dog or arm loose on said valve, a projection on said valve to move said dog when the valve is opened, means acting on the dog to turn the same in the reverse direction, a lever having a short and a long arm, the short arm cooperating with the said dog, and a thermostat acting onthe long arm of said lever to move the short arm thereof into the path of movement of the dog, substantially as described.

2. The combination with a detachable gasburner provided with a valve, a dog or arm loose on said valve, a projection on the valve engaging said dog or arm to move the same when the valve is rotated to turn on the gas, a leverextended longitudinally of the burner and pivoted thereto intermediate the ends of said lever and cooperating with said dog or arm to hold the same from movement in a reverse direction with said valve, and a thermostat attached to the burner and connected with said lever at one side of its pivot and operating to remove said lever from engagement with said dog or arm, substantially as described.

3. The combination with a gas-burner provided with a valve, a tip, and an insulatingsection intermediate said valve and tip, of a thermostat attached to said burner near said tip, a device movable independent of the valve, means on the valve for engaging said device, and a lever pivoted on the burner and actuated by the thermostat for engaging said device, substantially as described.

4. The combination with a gas-burner provided with a valve extended through the burner transversely thereof, a device movable independent of the valve, a thermostat attached to the burner near its tip, a lever extended in the direction of the length of the burner and pivoted to move in the same plane with said device and actuated by the thermostat to engage said device, a casing fitted on the burner to cover the said thermostat and lever, and a cap attached to the burner to cover the end of the valve and the said device, substantially as described.

5. The combination with a detachable gasbnrner provided with a valve extended transversely thereof, of a dog or arm loose on said valve, a projection on the valve for moving said dog or arm in one direction, a spring to move the dog or arm in the opposite direction, a lever pivoted to the burner intermediate the ends of the lever to move in the same plane as the dog or arm, and a thermostat connected with one arm of the lever to turn it on its pivot and move the other arm into engaging position with the said dog or arm, substantially as described.

In testimony whereof. I have signed my name to this specification in the presence of two subscribing witnesses.

LOUIS F. DUOKER.

lVitnesses:

J AS. H. CHURCHILL, J. MURPHY. 

